"250 GB/month is an extremely large amount of data," reads its official release, "much more than a typical residential customer uses on a monthly basis."

The "median" usage per customer is within 2 - 3 gigabytes per month, says Comcast. In order to exceed the data cap, a customer would have to send more than 50 million e-mails, download more than 62,000 songs, or watch more than 125 standard-definition, 2 GB movies per month.

Comcast's new policy on data consumption appears to be just a part of an overall initiative to reshape the way customers use its network. Last week the company announced its "fair share" program, which is designed to throttle a customers' connection when they consume too much bandwidth. Rumors of a bandwidth cap had been in circulation for quite some time -- Comcast, AT&T, and Time Warner were reported to be experimenting with the concept -- but the actual thresholds implemented proved to be much higher than predicted.

With the increasing popularity of internet-based video and software distribution, ISPs throughout the world are finding ways to curb customers' internet usage. While data caps are commonplace outside the United States, publicly-announced limits are incredibly rare among the U.S.' largest ISPs. Particularly egregious users have run into invisible limits, however, and a handful of heavy downloaders have seen up to a year's suspension of service due to crossing the company's "invisible line in the sand" despite paying for service advertised as unlimited.

Curiously, the announcement hints that the invisible threshold may have been 250 GB all along. "This is the same system we have in place today," says the announcement. "The only difference is that we will now provide a limit by which a customer may be contacted. As part of our pre-existing policy, we will continue to contact the top users of our high-speed Internet service and ask them to curb their usage."

AT&T Wireless users who exceeded an invisible 5gb quota -- a lot, considering that the network is designed for PDAs and Smartphones -- quickly learned of similar sanctions last year.

Subscribers who exceed their quota "may be contacted by Comcast to notify them of excessive use."

"At that time, we'll tell them exactly how much data per month they had used. We know from experience the vast majority of customers we ask to curb usage do so voluntarily," reads the release. Customers will be notified of the change through banner ads posted on the Comcast.net home page, as well as flyers to be included in upcoming billing statements.

A previous attempt to curb subscribers' usage, which ended up selectively meddling in a few different types of internet traffic -- BitTorrent, namely -- attracted the ire of the Federal Communications Commission due to a "discriminatory" preference against certain kinds of data. After almost a year of this, Comcast answered the FCC's demands with a handful of new programs designed to clamp down on excessive usage regardless of the protocols involved.

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My first computer had 8mb of ram and a 33mhz processor and 300mb of hard drive space. This was about 18 years ago. Now I have over a terabyte of hard drive space. One might assume the trend will continue.

250gb will be feeling very cramped very fast, give it 2-3 years when streaming HD video becomes plausable. Thats only about 25 movies a month in 1080p at the current HD resolution. If you have a 2160p screen by then (and yes that format already exists for extra large TVs) then it may be as few as 10 movies a month.

The caps are starting to show that businesses doing entertainment and providing telecommunication are conflicts of interest. If businesses don't want users using alternative solutions they shouldn't be in the business of providing conflicting business products. It's like Sony on 1 hand trying to provide content and on the other hand trying to create products that does not bite them back i.e. limited codecs and DRM.